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1989 Second International Conference on Holographic Systems, Components and Applications

11-13 Sept. 1989

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Displaying Results 1 - 25 of 47
  • Hologram interferometry as a tool to investigate transient waves in mechanics

    Publication Year: 1989, Page(s):1 - 5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (590 KB)

    Hologram interferometry is a very competitive tool for the study of transient events like the propagation of bending waves in plates and shells, to visualize shock waves in phase objects like air or water or just to record double exposure holograms of modes of vibration in optical modal analysis. A number of experiments to visualize wave propagation in solids and liquids are presented.<<ETX&... View full abstract»

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  • A holographic system for aerodynamic testing

    Publication Year: 1989, Page(s):6 - 15
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (733 KB)

    The authors investigate the suitability of holography as an optical flow diagnostic for turbofan nozzle flow structures. In this case a static 1/25th scale model of a powered turbo-fan nacelle has used for nacelle/wing integration studies and evaluated using a holographic technique. The holograms made show the core jet and the by-pass flow as it emerges from the nacelle nozzle system. They also sh... View full abstract»

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  • Stroboscopic holographic interferometry applied to the vibration of engineering structures and machines

    Publication Year: 1989, Page(s):16 - 20
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (514 KB)

    It is shown that stroboscopic holography can be usefully applied to study the vibration of large machines. It has been demonstrated that a great deal of complementary information can be gained from the stroboscopic technique compared with the normal time-average method, in particular damping characteristics and cyclic idiosyncrasies can be evaluated.<<ETX>> View full abstract»

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  • Reduction of aberrations in underwater holography

    Publication Year: 1989, Page(s):21 - 24
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (206 KB)

    Holographic measurements of engineering objects made in air have been extended to underwater measurement. This requires that the hologram of an object recorded in water is replayed in air which results in image degradation, especially at large field angles. The effect is basically that of an observer in air viewing an object in water and is caused by the change in refractive index. A technique is ... View full abstract»

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  • Large deformation analysis by holographic interferometry

    Publication Year: 1989, Page(s):25 - 28
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (747 KB)

    The method presented permits one to study large deformation quantitatively by a simple compensation technique: in real-time, the modification of the reference beam direction delivers the three components of the displacement, and the modification of the object beam direction provides the strain and rotation components of the surface element. For an object which may show large deflections under norm... View full abstract»

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  • Thermal stress in thin films using real-time holographic interferometry

    Publication Year: 1989, Page(s):29 - 32
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (210 KB)

    A study has been undertaken to set up a novel technique of measurement of thermal stress of thin films using real-time holographic interferometry. Using this technique thermal stress in conductive coatings has been studied and some results on iron and copper films are presented.<<ETX>> View full abstract»

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  • A new approach to the extraction of phase data from interferometric fringe patterns

    Publication Year: 1989, Page(s):33 - 37
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (291 KB)

    It is shown that the single phase step technique has some definite advantages over those using more phase steps. It gives a computationally simple solution for 0(x,y) performed at greatly increased speed utilising an 8-bit look-up table. Only one phase step is required which practically eliminates environmental drift errors, which is especially important at the data acquisition stage. Because it n... View full abstract»

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  • Embossed volume holograms: the Aztec structure

    Publication Year: 1989, Page(s):38 - 44
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (739 KB)

    Embossed holograms are surface-relief structures that typically result from recordings made interferometrically by the off-axis technique, where the fringe maxima lie on planes predominantly perpendicular to the recording surface and with an intensity variation that is sinusoidal. A new type of holographic recording called Aztec is discussed that combines features of off-axis and volume recording ... View full abstract»

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  • Replication techniques: different procedures for recording 2D, 3D images and transmission holographic optics

    Publication Year: 1989, Page(s):45 - 48
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (393 KB)

    Embossing procedures have been fully performed for rainbow 2D and 3D holograms and zone plates of the on-axis and off-axis design. Computer generation of the holographic optical elements is under development to obtain complex optical functions with high efficiency by proper fringe modeling techniques.<<ETX>> View full abstract»

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  • Choice of laser wavelengths for recording true-colour holograms

    Publication Year: 1989, Page(s):49 - 50
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (191 KB)

    Colour rendition in true-colour holograms is critically dependent on the choice of laser wavelengths used in the recording. It has traditionally been assumed by researchers in colour holography that the major goal in choosing suitable wavelengths for recording is that as great an area of the CIE chromaticity diagram as possible is covered. It is proposed that not only is this not necessary, but th... View full abstract»

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  • Development of a pulse laser system for the production and copying of holographic stereograms

    Publication Year: 1989, Page(s):51 - 55
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (286 KB)

    Advances in computer technology, computer aided design (CAD) and graphics equipment have led to displays of three dimensional objects with perspective correction and full shading. The final format of the output is restricted to two dimensions, limiting the visual impact and usefulness of the technique. The potential of synthetic holograms, and in particular holographic stereograms, to produce a fu... View full abstract»

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  • Head-up displays in motor cars

    Publication Year: 1989, Page(s):56 - 62
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (415 KB)

    Head-up displays (HUDs) are widely used in military aircraft to project a CRT display into a pilot's line of sight as he looks out of the aircraft cockpit. The HUD focuses the display image near to infinity to avoid the pilot having to refocus his eyes from viewing the outside world to read the display. A combiner plate is located between the pilot and the cockpit window to reflect the displayed i... View full abstract»

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  • From desired reconstruction to hologram distribution in digital holography

    Publication Year: 1989, Page(s):63 - 68
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (330 KB)

    Procedures to calculate the complex amplitude in digital holography are discussed. The determination of the complex amplitude in the hologram has been achieved for: 1-D input distributions along lines (e.g. straight arbitrary tilted lines and lines of elliptical shape); and 2-D distributions on an arbitrary oriented plane. The calculation of the complex amplitudes in case of a 1-D input distributi... View full abstract»

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  • Determining phase functions using annealing techniques

    Publication Year: 1989, Page(s):69 - 75
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (398 KB)

    An alternative approach is formulated for the determination of the function required to be encoded as a computer-generated hologram (CGH) to perform a set task. Filters plotted as CGH have in the past been used to perform co-ordinate transformations and optical fan-out operations. The functions required to perform these operations have been devised under the geometrical optics and paraxial ray app... View full abstract»

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  • The manufacture of blazed oblique zone plates for use at 10.6 mu m

    Publication Year: 1989, Page(s):76 - 79
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (551 KB)

    The authors have demonstrated that it is possible to produce blazed zone plates with high efficiency, good focal properties and unusual geometries and which are suitable for use in the 10 mu m spectral region. The method of plotting the pattern of zones on a grey scale phototypesetter and photoreducing into resist proved to be simple and straightforward for the present application. its virtue is i... View full abstract»

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  • Electron beam written diffractive optical elements

    Publication Year: 1989, Page(s):80 - 84
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (318 KB)

    Computer generated diffractive optical elements have been written in binary form in chrome on glass using the electron beam facilities at the Rutherford Appleton Laboratory in the UK. Some of the properties of polygonal elements are considered. These elements have been used as masters for subsequent copying into DCG to obtain higher diffraction efficiencies.<<ETX>> View full abstract»

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  • General diffraction-free fields produced by computer-generated holograms

    Publication Year: 1989, Page(s):85 - 89
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    Diffraction-free beams are peculiar physical wavefields that are finding an increasing number of applications. The authors demonstrate that useful approximations to various types of diffraction-free beams may be generated by means of computer holography. They also show that the properties of these reconstructed wavefields may be analysed efficiently by the method of stationary phase.<<ETX>... View full abstract»

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  • Dammann grating array generators in amorphous silicon nitride

    Publication Year: 1989, Page(s):90 - 92
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (227 KB)

    The authors give expressions for the power spectrum of a Dammann grating and present some advances in optimisation of the grating structure by stochastic algorithms. They then proceed to their experimental results in the fabrication of these elements in silicon nitride. Conventional photolithographic and electron-beam lithographic techniques are employed to construct the amplitude mask, which is c... View full abstract»

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  • Coding and quantization of computer generated Fresnel holograms

    Publication Year: 1989, Page(s):93 - 94
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (150 KB)

    Computer generated holograms are thin diffractive structures with specified diffraction characteristics. In the Fourier case such a hologram possesses a desired Fraunhofer diffraction pattern. In order to obtain this pattern in a finite distance from the hologram plane it is illuminated by a convergent or divergent spherical wave. The application of a digital hologram as a diffraction optical elem... View full abstract»

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  • Adaptive interferometers using photorefractive crystals

    Publication Year: 1989, Page(s):95 - 100
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (441 KB)

    The authors report the detailed study of salient features of an adaptive interferometer operating via dynamic two-wave mixing in a cubic photorefractive Bi/sub 12/SiO/sub 20/ crystal. Specifically, they measured its transfer function and demonstrated its differentiating and adaptive properties. The latter means that the device can efficiently detect a weak high-frequency phase-modulated signal at ... View full abstract»

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  • Harmonics and subharmonics of a grating in Bi/sub 12/SiO/sub 20/

    Publication Year: 1989, Page(s):101 - 105
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (240 KB)

    The formation of gratings in photorefractive materials has been widely investigated over two decades for applications in non-linear optics, optical signal processing, optical storage and dynamic holography. Bismuth silicon oxide, Bi/sub 12/SiO/sub 20/, with its high sensitivity and fast response, has emerged as a very promising material for real-time applications. It is shown that when two frequen... View full abstract»

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  • Dynamical-phase-modulated holography (DPMH)-a method for measuring hologram formation mechanisms and the nonlinear refractive index

    Publication Year: 1989, Page(s):106 - 110
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (259 KB)

    The authors describe the features distinguishing phase-modulated holography from phase-intensitive experiments. Dynamical-phase-modulated holography is an extension of the theory of PMH in order to measure additionally relaxation time constants in a range limited only by the modulation technique of choice. Another extension of this method is a 4-beam technique with separate write and read-out beam... View full abstract»

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  • Multigrating phase conjugation in photorefractive crystals; effect of unequal coupling strengths and absorption on the PCR

    Publication Year: 1989, Page(s):111 - 115
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (349 KB)

    The authors analyze the problem of determining the influence of four index grating types, namely, transmission, reflection, pump and signal with arbitrary relationships of their strengths. For this they solve the coupled-wave equations numerically, using a shooting and matching technique. The governing coupled-wave equations needed to solve the problem of multigrating phase conjugation in a more g... View full abstract»

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  • Large modulation effects in photorefractive crystals

    Publication Year: 1989, Page(s):116 - 122
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    A numerical solution to the band transport equations is presented, which is quite general, and predicts the behaviour of photorefractive materials in the saturation limit with a moving grating. The band transport equations are solved by a secular perturbation method, where the perturbation parameter is the fundamental component of the induced space charge field. In this manner, one can predict the... View full abstract»

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  • Adaptive running hologram recording and phase-shift measurement in photorefractive crystals

    Publication Year: 1989, Page(s):123 - 126
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (230 KB)

    The author reports the use of phase modulation techniques in two-wave mixing (2WM) experiments for measuring the phase shift psi between the interference pattern projected onto a photorefractive crystal and the resulting recorded hologram, as a function of the externally applied electric field E. Such data are used for computing the photoelectron trap density N/sub A/ in the crystal. Phase modulat... View full abstract»

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